Should Mike Be Allowed to Testify

Should Mike be allowed to testify

A) Yes, he can testify as a lay witness and describe what he saw.
B) Yes, he can testify as a law witness and give his opinion that Ian had mental problems.
C) No, only mental health professionals can testify when the defendant is trying to establish Not Guilty by Reason of Insanity.
D) No, the only information from clinical interviews is admissible when the defendant is trying to establish Not Guilty by Reason of Insanity.